body{
    margin: 0;
    width: 100%;
    height: 800px;
}
.header{
    width: 100%;
    height: 10%;
    /*background-image: linear-gradient(to bottom right, #18fff7, #ffaec4);*/
    margin: 0;
    padding: 0;
    display: flex;
    background-color: white;
}

.header p{
    width: 10%;
    margin: 0;
    padding: 0;
    font-size: 30px;
    color: #CCCCCC;
    background-color: #333333;
    border-bottom: 2px solid black;
    align-items: center;
    justify-content: center;
    display: flex;
}
#right_nav{
    align-items: center;
    display: flex;
    width: 90%;
}
.header ul{
    padding-inline-start: 0;
    display: flex;
    right: 0;
    position: absolute;
}
.header li{
    list-style: none;
    width: 120px;
    margin-right: 10px;
    border-left: 2px solid #D2D2D2;
    text-align: center;
    color: #333333;
}
.content{
    width: 100%;
    height: 80%;
    display: flex;
}
#left_nav{
    width: 10%;
    height: 100%;
    background-color: #333333;
}
#left_nav ul{
    padding-inline-start: 0;
}
#left_nav li{
    list-style: none;
    width: 90%;
    height: 50px;
    margin-top: 10px;
    margin-left: 8px;
    line-height: 50px;
    text-align: center;
    border-bottom: 2px solid black;
}
#left_nav li:hover{
    background-color: #184242;
    border-radius: 5px;
}
a{
    text-decoration: none;
    color: white;
}
#right_con{
    width: 90%;
    height: 100%;
    background-color: #F2F2F2;
}
#index_img{
    width: 100%;
    height: 100%;
}
.foo{
    height: 10%;
    width: 100%;
    background-image: linear-gradient(to bottom right, #18fff7, #ffaec4);
    display: flex;
    justify-content: center;
    align-items: center;
}
.foo p{
    margin: 0;
    padding: 0;
    font-size: 15px;
}